639083405 has 8 divisors (see below), whose sum is σ = 800243712. Its totient is φ = 489037648.

The previous prime is 639083387. The next prime is 639083443. The reversal of 639083405 is 504380936.

639083405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639083405 - 2⁸ = 639083149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778509 + ... + 2778738.

It is an arithmetic number, because the mean of its divisors is an integer number (100030464).

Almost surely, 2^639083405 is an apocalyptic number.

It is an amenable number.

639083405 is a deficient number, since it is larger than the sum of its proper divisors (161160307).

639083405 is a wasteful number, since it uses less digits than its factorization.

639083405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557275.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 639083405 is about 25280.0989911037. The cubic root of 639083405 is about 861.3622744409.

The spelling of 639083405 in words is "six hundred thirty-nine million, eighty-three thousand, four hundred five".